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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Environmental Remediation Contingency [Domain] |  |
Environmental Contingencies |  |
Liability recorded for projected environmental remediation costs | $ 5 | $ 5
Litigation [Member] |  |
Litigation Contingencies |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | 48 | $ 50
Maximum [Member] | Environmental Remediation Contingency [Domain] |  |
Litigation Contingencies |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) | 16 |
Maximum [Member] | Litigation [Member] |  |
Litigation Contingencies |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) | 127 |
Minimum [Member] | Litigation [Member] |  |
Litigation Contingencies |  |
Loss Contingency, Estimate of Possible Loss ( Equal to or less than) | $ 99 |

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12021-110248 + Details
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